<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>基本</title>
    <style>
        #zhangzhang{color: rgb(212, 26, 26);}
        #bixiaojie{color: royalblue}
    </style>
</head>
<body>
<p id="zhangzhang">
   标题1
</p>
<p  id="zhangzhang">
   标题2
</p>
<p>
   标题3
</p>
<p id="bixiaojie">Hello World</p>
</body>
</html>